Abstract
Cracks occur in reinforced concrete slabs for two reasons - due to increased operational loads and due to manufacturing and installation defects. When cracks are detected, the question arises about the residual bearing capacity of the slab and the need of its strengthening. To solve this problem by calculation, it is necessary to take into account physical nonlinearity. An algorithm for the calculation by the finite element method is proposed. The main feature of the algorithm is the use of multilayered finite elements, which allows modeling the cracks by specifying the corresponding material characteristics of those layers which the crack passes through. A method for determining the bearing capacity of a slab with cracks after its reinforcement with composite fabrics is also considered. An example of the study of the stress-strain state of a reinforced concrete slab with cracks by the proposed method is given. The implementation of the algorithm in the PRINS program is described and the possibility of using this program for solving practical problems is discussed.
Highlights
Successes in the production of building materials [1,2,3,4,5], on the one hand, and in the technology of building production [6,7] - on the other, provide the possibility of reconstruction and repair of reinforced concrete structures without their dismantling
The method of the stress-strain state analysis of reinforced concrete slabs in which cracks arise during long-term operation and the implementation of this method in the computer program PRINS are described in this paper
To determine the bearing capacity of reinforced concrete slabs the algorithm described in the previously published works of the author is used in the PRINS program
Summary
Successes in the production of building materials [1,2,3,4,5], on the one hand, and in the technology of building production [6,7] - on the other, provide the possibility of reconstruction and repair of reinforced concrete structures without their dismantling. A feature of such studies is a change in the design model of the structure as a result of repair or reconstruction [13], as well as the presence of initial stresses and strains if reinforcement works are carried out on retention of the entire operational load or part of it. This requires the development of special software or making appropriate additions to existing programs. The method of the stress-strain state analysis of reinforced concrete slabs in which cracks arise during long-term operation and the implementation of this method in the computer program PRINS are described in this paper
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